Israeli airstrikes in Gaza have killed at least 27 people sheltering at a school, according to the Hamas-run health ministry. The strike has been condemned by Hamas as a 'heinous massacre' of innocent civilians. The Israeli military has been intensifying its attacks on what it claims are Hamas targets, resulting in over 100 Palestinian deaths. The IDF has been stepping up its offensive in an attempt to put pressure on Hamas and eventually expel the militant group.